study Chpt 18 - Chpt 18 One tectonic setting is the Andean...

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Chpt 18 One tectonic setting is the Andean type where fold-thrust belts can develop in 2 locations: The accretionary prism-The sediments are from deep water environments consisting of radiolarian cherts, pelagic mudstone, pillow basalts, oceanic crust and anything else that might be brought in by the subducting plate. Ex: Franciscan complex The back-arc region For-thrust belts in the back arc region require compression across the arc. On continents, these thrust belts occur in the back arc region, and they verge toward the continental interior (sometimes called the “foreland”). The weight of the thrust sheets may produce a “foreland” basin in front of them. thrust belts is the passive continental margin that collides with an active continental margin. The accretionary prism is squeezed between the two continents. Rifted continental curst at the edge of the passive margin is reactivated and thrust up over the shelf sediments. Thrust faults form in the shelf sediments along bedding plane detachments and ramp upward toward the foreland. Tectonically thickened sediments depress the crust producing a foreland basin in front of the thrust belt. Ex: himalyas Inverted Rift basins occur when an unsuccessful rift is later compressed approximately perpendicular to the rift trend. Ex: pyrennes
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study Chpt 18 - Chpt 18 One tectonic setting is the Andean...

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